Aluminum Bushing/Standoff /Spacer/Sleeve 1/2 " OD x 1/4" ID x 3" Long.  Made with 6061 aluminum. Hole is clearance for 1/4" bolt. Actual size is .251-.255.  You will get 2 pieces in a lot.

ALL OF MY PARTS ARE MADE BY MYSELF, IF YOU NEED A CHANGE ON DIMENSIONS JUST MESSAGE ME.